Butter tarts are a classic Canadian dessert made with a flaky pastry shell filled with a sweet, gooey mixture of butter, sugar, and eggs. They can be made with various fillings, including raisins or pecans, and are known for their rich, caramel-like flavor. These tarts are typically baked until the filling is set but still slightly runny in the center. Butter tarts are often enjoyed warm or at room temperature and are a popular treat at festivals and family gatherings across Canada.